Note: Descriptions are shown in the official language in which they were submitted.
BATTERY CELL, BATTERY, POWER CONSUMPTION
APPARATUS, METHOD AND APPARATUS FOR
PRODUCING BATTERY CELL
TECHNICAL FIELD
[0001] The present application relates to the field of battery
technologies, and in
particular, to a battery cell, a battery, a power consumption apparatus, a
method and an
apparatus for producing a battery cell.
BACKGROUND
[0002] Energy conservation and emission reduction are the key
to the sustainable
development of the automotive industry. In this case, electric vehicles have
become an
important part of the sustainable development of the automotive industry due
to their
advantages of energy conservation and environmental protection. For the
electric
vehicles, the battery technology is an important factor for their development.
[0003] In the development of the battery technology, in
addition to improving
performance of batteries, safety is also an issue that cannot be ignored. If
the safety of
the batteries cannot be ensured, the batteries cannot be used. Therefore, how
to enhance
the safety of the batteries is an urgent technical problem to be solved in the
battery
technology.
SUMMARY
[0004] The present application provides a battery cell, a battery, a power
consumption apparatus, a method for producing a battery cell and an apparatus
for
producing a battery cell, which could enhance safety of the battery.
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[0005] In a first aspect, a battery cell is provided,
including: a pressure relief
mechanism, the pressure relief mechanism being disposed on at least one wall
of the
battery cell, and the pressure relief mechanism being configured to be
actuated when
an internal pressure or temperature of the battery cell reaches a threshold,
to relieve the
internal pressure; and a protective film enclosing an outer surface of the at
least one
wall, the protective film being configured to provide insulation protection
for the at
least one wall; where the protective film includes a first portion, and the
first portion at
least covers the pressure relief mechanism.
[0006] In an embodiment of the present application, by
providing a protective film
enclosing an outer surface of at least one wall for a battery cell, insulation
protection
can be provided for the battery cell, and insulation performance of the
battery cell can
be improved; meanwhile, a first portion of the protective film that at least
covers a
pressure relief mechanism can have a suppression effect on a certain degree of
deformation of the pressure relief mechanism, and reduce creep of the pressure
relief
mechanism, thereby increasing the service life of the pressure relief
mechanism, and
further enhancing safety performance of a battery.
[0007] In some embodiments, an area of the first portion is
larger than an area of a
region where the pressure relief mechanism is located, and a region of the
first portion
that exceeds the pressure relief mechanism is adhered to the outer surface of
the at least
one wall.
[0008] By setting that an area of the first portion is larger
than an area of a region
where the pressure relief mechanism is located and a region of the first
portion that does
not cover the pressure relief mechanism is adhered to the at least one wall,
it can have
a suppression effect on the deformation of the pressure relief mechanism
through an
adhesive force generated between the first portion and the at least one wall,
and the
creep of the pressure relief mechanism can be reduced, thereby increasing the
service
life of the pressure relief mechanism, and further enhancing the safety
performance of
the battery.
[0009] In some embodiments, a shape of the first portion is the
same as or similar
to a shape of the pressure relief mechanism.
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[0010] By setting that a shape of the first portion is the same
as or similar to that of
the pressure relief mechanism, it can be ensured that a force generated by the
deformation of the pressure relief mechanism that the protective film is
subjected to is
uniform, which is more beneficial to suppression of the deformation of the
pressure
relief mechanism by the first portion.
[0011] In some embodiments, an edge of the first portion
exceeds an edge of the
pressure relief mechanism by 6mm-1Omm in a direction far away from a center of
the
pressure relief mechanism.
[0012] By setting an appropriate size for an edge of the first
portion that exceeds an
edge of the pressure relief mechanism, it can be ensured that the first
portion could have
a suppression effect on a certain degree of deformation of the pressure relief
mechanism;
meanwhile, it can also be ensured that the first portion can be damaged when
the
internal pressure and temperature of the battery cell reach a certain
threshold, so that
the first portion falls off, thereby ensuring normal actuation of the pressure
relief
mechanism, not affecting normal use of the pressure relief mechanism, and
ensuring
the safety of the battery.
[0013] In some embodiments, at least one wall of the battery
cell includes a housing,
the housing forms an accommodating cavity with an opening for accommodating an
electrode assembly of the battery cell, and the protective film encloses an
outer surface
of the housing.
[0014] The battery cell in the embodiment of the present
application may include a
housing, where the housing may be an accommodating cavity with an opening that
is
composed of five walls except a cover plate, and the protective film in the
embodiment
of the present application may completely or largely enclose an outer surface
of the
foregoing housing, thereby performing insulation protection for the battery
cell.
[0015] In some embodiments, the protective film further
includes an isolation
region and a second portion, the firs portion is separated from the second
portion by the
isolation region, and the second portion covers an outer surface of the at
least one wall
other than a region covered by the first portion.
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[0016] In addition to the first portion, the protective film in
the embodiment of the
present application further includes a second portion, where the first portion
and the
second portion are separated by an insulation region, and the second portion
may cover
a region on the battery cell other than a region covered by the first portion.
Therefore,
in the embodiment of the present application, the protective film can suppress
the
deformation of the pressure relief mechanism through the first portion, and
the second
portion of the protective film can achieve insulation protection for the
battery cell at the
same time.
[0017] In some embodiments, the isolation region is disposed
around an outer edge
of the pressure relief mechanism.
[0018] The insulation region disposed around the edge of the
pressure relief
mechanism can divide the protective film into a first portion covering the
pressure relief
mechanism and a second portion not covering the pressure relief mechanism.
[0019] In some embodiments, the isolation region is coherent,
and the first portion
and the second portion are not connected.
[0020] In an embodiment of the present application, when the
isolation region is a
coherent region without a connecting point, relying on a portion where the
edge of the
first portion is adhe red to a surface of the at least one wall, the first
portion can have a
suppression effect on the deformation of the pressure relief mechanism to some
extent,
and reduce the creep of the pressure relief mechanism, thereby increasing the
service
life of the pressure relief mechanism, and further enhancing the safety
performance of
the battery.
[0021] In some embodiments, the isolation region is incoherent,
a connecting point
is disposed between the first portion and the second portion, and the first
portion and
the second portion are connected through the connecting point.
[0022] The isolation region in the embodiment of the present
application may also
be incoherent, the first portion can be connected to the second portion
through a
connecting point. Due to the existence of the connecting point, there is a
restraining
force between the first portion and the second portion, and the restraining
force can
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have a suppression effect on the deformation of the pressure relief mechanism
to some
extent.
[0023] In some embodiments, a number of connecting points is
positively
correlated with a size of an edge of the first portion that exceeds an edge of
the pressure
relief mechanism in a direction far away from a center of the pressure relief
mechanism.
[0024] Due to the existence of the connecting point, there is a
restraining force
between the first portion and the second portion, and the restraining force
can suppress
the deformation of the pressure relief mechanism. Moreover, as the number of
connecting points increases, the restraining force increases. Meanwhile, since
there is
also a certain restraining force between a position of the first portion that
exceeds the
edge of the pressure relief mechanism and the surface of the at least one wall
of the
battery lift, the restraining force increases with the increase of an area of
an overlap
region. Therefore, the foregoing two manners can be combined to determine the
appropriate number of connecting points and the size of the first portion that
exceeds
the edge of the pressure relief mechanism. For example, when the number of
connecting
points is great, a smaller size that exceeds the edge can be set, so that the
first portion
can ensure the suppression of a certain degree of deformation of the pressure
relief
mechanism, and ensure the normal operation of the pressure relief mechanism.
[0025] In some embodiments, the battery cell includes two
electrode terminals with
opposite polarities, and at least two connecting points are disposed along a
direction of
a line between the two electrode terminals.
[0026] It should be understood that in the battery cell, when
there are electrode
terminals, a position where an amount of deformation of the battery cell is
maximum
may appear in a direction along a line between two battery terminals.
Therefore, the
connecting point can be disposed in a direction of a line between two
electrode
terminals to achieve a better effect of suppressing the deformation of the
pressure relief
mechanism.
[0027] In some embodiments, the protective film is a patch, and
the protective film
is adhered to the outer surface of the at least one wall by an adhesive.
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[0028] The protective film in the embodiment of the present
application may be a
patch, such as a plastic path, or a blue film. The patch may be adhered to a
surface of at
least one wall by an adhesive, and through the adhesion between the protective
film and
the at least one wall, the deformation of the pressure relief mechanism can be
effectively
suppressed, and the creep of the pressure relief mechanism can be reduced,
thereby
increasing the service life of the pressure relief mechanism.
[0029] In some embodiments, the first portion is spaced apart
from the pressure
relief mechanism.
[0030] When the protective film in the embodiment of the
present application is a
patch, since the patch is directly adhered to a surface of at least one wall,
there may be
a gap between the first portion and the pressure relief mechanism when the
pressure
relief mechanism in the embodiment of the present application is embedded in
the
surface of the at least one wall of the battery cell, the gap can allow a
certain degree of
deformation of the pressure relief mechanism to be suppressed by the first
portion, and
the creep of the pressure relief mechanism is reduced, thereby increasing the
service
life of the pressure relief mechanism.
[0031] In some embodiments, an isolation region is formed by
laser ablation of the
protective film.
[0032] When the protective film in the embodiment of the
present application is a
patch, the protective film can be processed by a laser ablation process to
form an
insolation region separating the first portion from the second portion. By the
laser
ablation process, only a motion track and ablation power of a laser head can
be adjusted
according to the size and shape of the first portion on the basis of the
existing processes,
and there is no need to repeat open molding, thereby reducing the processing
costs.
[0033] In some embodiments, the protective film is a coating, and outer
surfaces of
the at least one wall and the pressure relief mechanism are coated with the
protective
film by means of spraying.
[0034] A coating may be adopted for the protective film in the
embodiment of the
present application. In this case, at least one wall of the battery cell can
be coated with
the coating by means of spraying. Since the coating is sprayed, the coating
can be in
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direct contact with the pressure relief mechanism, that is, the coating
directly covers the
surface of the pressure relief mechanism. In this case, since the surface of
the pressure
relief mechanism is directly coated with the coating, there is also a
restraining force
between the coating and the pressure relief mechanism, and the restraining
force can
have a suppression effect on the deformation of the pressure relief mechanism.
[0035] In some embodiments, an isolation region is formed by
skipping coating
some reserved region when surfaces of the at least one wall and the pressure
relief
mechanism are coated with the protective film.
[0036] When the protective film in the embodiment of the
present application is a
coating, the isolation region on the protective film may be an isolation
region formed
by skipping coating some reserved region when the coating is sprayed, for
example, by
placing a mold in a certain shape in advance at a position where the isolation
region is
formed, so as to prevent the coating from being coated at the position of the
isolation
region.
[0037] In some embodiments, a thickness of the first portion is greater
than a
thickness of a second portion.
[0038] When the protective film in the embodiment of the
present application is a
coating, within a certain range, a coating thickness is greater, and a
restraining force
produced between the coating and the pressure relief mechanism is greater.
Therefore,
the first portion can be set to have a greater thickness to suppress the
deformation of
the pressure relief mechanism better.
[0039] In a second aspect, a battery is provided, including: a
plurality of battery
cells, the plurality of battery cells including the battery cell according to
the first aspect;
where the plurality of battery cells are insulated from each other through the
protective
film.
[0040] In a third aspect, a power consumption apparatus is
provided, including the
battery according to the second aspect.
[0041] In some embodiments, the power consumption apparatus is
a vehicle, a ship
or a spacecraft.
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[0042] In a fourth aspect, a method for producing a battery
cell is provided,
including: disposing a pressure relief mechanism on at least one wall of the
battery cell,
the pressure relief mechanism being configured to be actuated when an internal
pressure
or temperature of the battery cell reaches a threshold, to relieve the
internal pressure;
and enclosing an outer surface of the at least one wall with a protective
film, the
protective film being configured to provide insulation protection for the at
least one
wall; where the protective film includes a first portion, and the first
portion at least
covers the pressure relief mechanism.
[0043] In some embodiments, an area of the first portion is
larger than an area of a
region where the pressure relief mechanism is located, and a region of the
first portion
that exceeds the pressure relief mechanism is adhered to the outer surface of
the at least
one wall.
[0044] In some embodiments, a shape of the first portion is set
to be the same as or
similar to a shape of the pressure relief mechanism.
[0045] In some embodiments, an edge of the first portion is set to exceed
an edge
of the pressure relief mechanism by 6mm-10mm in a direction far away from a
center
of the pressure relief mechanism.
[0046] In some embodiments, at least one wall of the battery
cell includes a housing,
the housing forms an accommodating cavity with an opening for accommodating an
electrode assembly of the battery cell, and the protective film encloses an
outer surface
of the housing.
[0047] In some embodiments, the protective film further
includes an isolation
region and a second portion, the firs portion is separated from the second
portion by the
isolation region, and the enclosing the outer surface of the at least one wall
with the
protective film includes: allowing the second portion to cover an outer
surface of the at
least one wall other than a region covered by the first portion.
[0048] In some embodiments, the isolation region is disposed
around an outer edge
of the pressure relief mechanism.
[0049] In some embodiments, the isolation region is coherent,
and the first portion
and the second portion are not connected.
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[0050] In some embodiments, the isolation region is incoherent,
a connecting point
is disposed between the first portion and the second portion to form the
incoherent
isolation region, and the first portion and the second portion are connected
through the
connecting point.
[0051] In some embodiments, a number of connecting points is positively
correlated with a size of an edge of the first portion that exceeds an edge of
the pressure
relief mechanism in a direction far away from a center of the pressure relief
mechanism.
[0052] In some embodiments, the battery cell includes two
electrode terminals with
opposite polarities, and at least two connecting points are disposed along a
direction of
a line between the two electrode terminals.
[0053] In some embodiments, the protective film is a patch, and
the enclosing the
outer surface of the at least one wall with the protective film includes:
adhering the
protective film to the outer surface of the at least one wall by an adhesive.
[0054] In some embodiments, the first portion is spaced apart
from the pressure
relief mechanism.
[0055] In some embodiments, the isolation region is formed by
laser ablation of the
protective film after adhering the protective film to the outer surface of the
at least one
wall by the adhesive.
[0056] In some embodiments, the protective film is a coating,
and the enclosing the
outer surface of the at least one wall with the protective film includes:
coating outer
surfaces of the at least one wall and the pressure relief mechanism with the
protective
film by means of spraying.
[0057] In some embodiments, the enclosing the outer surface of
the at least one wall
with the protective film further includes: skipping coating some reserved
region to form
the isolation region when the outer surfaces of the at least one wall and the
pressure
relief mechanism are coated with the protective film.
[0058] In some embodiments, a coating thickness of the first
portion is set to be
greater than a coating thickness of the second portion.
[0059] In a fifth aspect, an apparatus for producing a battery
cell is provided,
including: a setting module, the setting module being configured to: dispose a
pressure
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relief mechanism on at least one wall of the battery cell, the pressure relief
mechanism
being configured to be actuated when an internal pressure or temperature of
the battery
cell reaches a threshold, to relieve the internal pressure; and cover an outer
surface of
the at least one wall with a protective film, the protective film being
configured to
provide insulation protection for the at least one wall; where the protective
film includes
a first portion, and the first portion at least covers the pressure relief
mechanism.
BRIEF DESCRIPTION OF DRAWINGS
[0060] In order to illustrate the technical solutions in
embodiments of the present
application more clearly, brief description will be made below to accompanying
drawings required in the embodiments of the present application. Apparently,
the
accompanying drawings described below are some embodiments of the present
application only, and other drawings could be obtained based on these
accompanying
drawings by those ordinary skilled in this art without creative efforts.
[0061] FIG. 1 is a schematic structural diagram of a vehicle
disclosed in an
embodiment of present application;
[0062] FIG. 2 is a schematic structural diagram of a battery
disclosed in an
embodiment of the present application;
[0063] FIG. 3 is a schematic structural diagram of a battery
cell group disclosed in
an embodiment of the present application;
[0064] FIG. 4 is an exploded view of a battery cell disclosed in an
embodiment of
the present application;
[0065] FIG. 5 is an exploded view of a battery cell disclosed
in another embodiment
of the present application;
[0066] FIG. 6 is a schematic diagram of distribution of a
pressure relief mechanism
disclosed in an embodiment of the present application;
[0067] FIG. 7a is a schematic diagram of a battery cell
disclosed in an embodiment
of the present application;
CA 03166962 2022- 8-3
[0068] FIG. 7b is a plan schematic diagram corresponding to the
battery cell in FIG.
7a;
[0069] FIG. 7c is a partial detailed view corresponding to a
protective film;
[0070] FIG. 8 is a plan schematic diagram of an isolation
region disclosed in an
embodiment of the present application;
[0071] FIG. 9 is a plan schematic diagram of another isolation
region disclosed in
an embodiment of the present application;
[0072] FIG. 10 is a plan schematic diagram of another isolation
region disclosed in
an embodiment of the present application;
[0073] FIG. 11 is a plan schematic diagram of a protective film disclosed
in an
embodiment of the present application;
[0074] FIG. 12 is a plan schematic diagram of a protective film
disclosed in an
embodiment of the present application;
[0075] FIG. 13 is a schematic flowchart of a method for
producing a battery cell
disclosed in an embodiment of the present application; and
[0076] FIG. 14 is a schematic block diagram of an apparatus for
producing a battery
cell disclosed in an embodiment of the present application.
[0077] In the accompanying drawings, the accompanying drawings
are not drawn
to actual scale.
DESCRIPTION OF EMBODIMENTS
[0078] Implementation manners of the present application will
be further described
below in detail with reference to the accompanying drawings and embodiments.
The
detailed description of the following embodiments and the accompanying
drawings are
used to exemplarily illustrate principles of the present application, but
cannot be used
to limit the scope of the present application, that is, the present
application is not limited
to the described embodiments.
[0079] In the description of the present application, it should
be noted that, unless
otherwise illustrated, "a plurality of" means more than two; and orientations
or
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positional relationships indicated by terms such as "up", "down", "left",
"right",
"inside", and "outside" are merely for convenience of describing the present
application
and for simplifying the description, rather than for indicating or implying
that an
indicated apparatus or element must have a specific orientation, and must be
constructed and operated in a specific orientation, which thus shall not be
understood
as limitation to the present application. In addition, the terms such as
"first", "second",
and "third" are merely intended for the purpose of description, and shall not
be
understood as an indication or implication of relative importance. "Vertical"
is not
strictly vertical, but within an allowable range of error. "Parallel" is not
strictly parallel,
but within an allowable range of error.
[0080] The terms representing directions in the following
description are all
directions shown in the drawings, and do not limit the specific structure of
the present
application. In the description of the present application, it should be
further noted that,
unless explicitly specified and defined otherwise, terms "installation",
"interconnection"
and "connection" should be understood broadly, for example, they may either be
a fixed
connection, or a detachable connection, or an integrated connection; and they
may
either be a direct connection, or an indirect connection through an
intermediary. Those
of ordinary skill in the art may understand the specific meanings of the
foregoing terms
in the present application according to specific conditions.
[0081] A protective film of the embodiments of the present application may
be
configured to wrap a battery cell. The protective film may be an insulating
and
waterproof material for insulation, isolation and waterproofing of the battery
cell. The
protective film may further wrap a battery assembly, the battery assembly may
be a
battery cell or an assembly formed by a battery cell, for example, a battery
cell group
formed by a plurality adjacent battery cells. In this case, the plurality of
adjacent battery
cells are integrally wrapped by the protective film of the embodiments of the
present
application. For convenience of description, an example that a protective film
wraps a
battery cell will be illustrated below, which is not limited in the
embodiments of the
present application.
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[0082] The protective film in the embodiments of the present
application may be a
protective film enclosing at least one wall of a battery cell after the steps
such as a
performance test are performed on the battery cell during the molding process
of the
battery cell, thereby performing insulation protection for the battery cell.
[0083] Optionally, the protective film in the embodiments of the present
application
may be a blue film (blue film) commonly used in the field of batteries.
[0084] In the present application, a battery cell may include
a primary battery, a
secondary battery, such as a lithium-ion battery, a lithium-sulfur battery, a
sodium
lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, which is
not
limited in the embodiments of the present application. The battery cell may be
cylindrical, flat, cuboid or in another shape, which is also not limited in
the
embodiments of the present application. A battery cell is generally divided
into three
types according to the way of packaging: a cylindrical battery cell, a
prismatic battery
cell and a pouch battery cell, which is also not limited in the embodiments of
the present
application.
[0085] The battery mentioned in the embodiments of the present
application refers
to a single physical module including one or more battery cells to provide a
higher
voltage and capacity. The battery pack generally includes a box for packaging
one or
more battery cells. The box can avoid liquid or other foreign matters to
affect charging
or discharging of the battery cell.
[0086] The battery cell includes an electrode assembly and an
electrolyte, and the
electrode assembly includes a positive electrode sheet, a negative electrode
sheet and a
separator. The operation of the battery cell mainly relies on movement of
metal ions
between the positive electrode sheet and the negative electrode sheet. The
positive
electrode sheet includes a positive electrode current collector and a positive
electrode
active material layer. The positive electrode active material layer is coated
on a surface
of the positive electrode current collector, the current collector not coated
with the
positive electrode active material layer protrudes from the current collector
coated with
the positive electrode active material layer, and the current collector not
coated with the
positive electrode active material layer serves as a positive tab. In an
example of a
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lithium-ion battery, a material of the positive electrode current collector
may be
aluminum, and a positive electrode active material may be lithium cobalt
oxides,
lithium iron phosphate, ternary lithium, lithium manganate, or the like. The
negative
electrode sheet includes a negative electrode current collector and a negative
electrode
active material layer. The negative electrode active material layer is coated
on a surface
of the negative electrode current collector, the current collector not coated
with the
negative electrode active material layer protrudes from the current collector
coated with
the negative electrode active material layer, and the current collector not
coated with
the negative electrode active material layer serves as a negative tab. A
material of the
negative electrode current collector may be copper, and a negative electrode
active
material may be carbon, silicon, or the like. In order to ensure that no
fusing occurs
when a large current passes, there are a plurality of positive tabs which are
stacked
together, and there are a plurality of negative tabs which are stacked
together. A material
of the protective film may be Polypropylene (Polypropylene, PP), Polyethylene
(Polyethylene, PE), or the like. In addition, the electrode assembly may be a
winding
structure or a laminated structure, and the embodiments of the present
application are
not limited thereto. With the development of the battery technology, it is
necessary to
consider design factors in multiple aspects simultaneously, such as energy
density, cycle
life, discharge capacity, C-rate and other performance parameters. In
addition, safety of
the battery should also be considered.
[0087] For a battery, a main safety hazard comes from charging
and discharging
processes, and in order to improve safety performance of the battery, a
battery cell is
generally provided with a pressure relief mechanism. The pressure relief
mechanism
refers to an element or component that is actuated when an internal pressure
or
temperature of the battery cell reaches a predetermined threshold, to relieve
the internal
pressure or temperature. The predetermined threshold may be adjusted according
to
different design demands. The predetermined threshold may depend on a material
of
one or more of a positive electrode sheet, a negative electrode sheet, an
electrolyte and
a separator in the battery cell. The pressure relief mechanism may adopt, for
example,
a pressure-sensitive or temperature-sensitive element or component. That is,
when the
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internal pressure or temperature of the battery cell reaches the predetermined
threshold,
the pressure relief mechanism is actuated, so as to form a channel for
relieving the
internal pressure or temperature.
[0088] The "actuation" mentioned in the present application
means that the pressure
relief mechanism acts, so that the internal pressure and temperature of the
battery cell
can be relieved. The action generated by the pressure relief mechanism may
include but
be not limited to: at least a part of the pressure relief mechanism being
fractured, torn
or melted, and so on. After the pressure relief mechanism is actuated, high-
temperature
and high-pressure substances inside the battery cell are discharged outward
from the
pressure relief mechanism as emissions. In this way, the pressure of the
battery cell can
be relieved at a controllable pressure or temperature, thereby avoiding
potentially more
serious accidents.
[0089] The emissions from the battery cell mentioned in the
present application
include but are not limited to: an electrolyte, dissolved or split positive
and negative
electrode sheets, fragments of a separator, high-temperature and high-pressure
gas
generated by reaction, flame, or the like.
[0090] The pressure relief mechanism on the battery cell has
an important impact
on the safety of the battery. For example, when short circuit, overcharge and
other
phenomena occur in the battery cell, it may lead to thermal runaway inside the
battery
cell, resulting in a sudden increase in pressure or temperature. In this case,
the internal
pressure and temperature can be released outward through the actuation of the
pressure
relief mechanism, to prevent the battery cell from exploding and catching
fire.
[0091] In the current solutions of the pressure relief
mechanism, the internal
pressure or temperature can be released outward after the actuation of the
pressure relief
mechanism, to ensure the safety performance of the battery cell. However,
before the
pressure relief mechanism is actuated, creep phenomenon occurs in the pressure
relief
mechanism under the long-term stress effect and higher and higher temperature
effect.
The creep phenomenon of the pressure relief mechanism is embodied as grain
boundary
sliding of the pressure relief mechanism in the microscopic view, grains
spread along
the grain boundary, and finally the pressure relief mechanism becomes thinner
in
CA 03166962 2022- 8-3
structure, resulting in a decrease in capacity to bear pressure for the
pressure relief
mechanism, that is, the pressure relief mechanism deforms and there is a
thinning region.
Overtime, an amount of deformation of the pressure relief mechanism becomes
greater,
so that the actuation pressure of the pressure relief mechanism becomes less.
If the
amount of deformation of the pressure relief mechanism is not controlled, a
creep
failure phenomenon that the pressure relief mechanism is torn occurs when the
amount
of deformation of the pressure relief mechanism reaches a certain degree,
which reduces
the service life of the pressure relief mechanism, and further reduces the
service life of
the battery. Moreover, this creep failure phenomenon is concealed and is not
easy to be
found, so that the failed pressure relief mechanism is not easy to be found,
which greatly
affects the safety performance of the battery.
[0092] In view of this, an embodiment of the present
application provides a
technical solution that at least one wall of a battery cell that includes a
pressure relief
mechanism is enclosed with a protective film, where a first portion included
in the
protective film at least covers the pressure relief mechanism. On one hand, by
enclosing
the battery cell, a surface of the battery cell can be insulated and
protected, thereby
improving insulation and isolation performance of the battery cell. On the
other hand,
by covering the pressure relief mechanism of the battery cell, the protective
film can
suppress deformation of the pressure relief mechanism, thereby reducing an
amount of
creep of the pressure relief mechanism, increasing the service life of the
pressure relief
mechanism, and further improving the safety of the battery.
[0093] The technical solutions described in the embodiments of
the present
application are all applicable to various apparatuses using batteries, such as
mobile
phones, portable devices, notebook computers, electromobiles, electric toys,
electric
tools, electric vehicles, ships and spacecrafts. For example, the spacecrafts
include
airplanes, rockets, space shuttles, spaceships, and the like.
[0094] It should be understood that the technical solutions
described in the
embodiments of the present application are not only applicable to the devices
described
above, but also applicable to all devices using batteries. However, for brief
description,
the following embodiments are all described by an example of an electric
vehicle.
16
CA 03166962 2022- 8-3
[0095] For example, as shown in FIG. 1, FIG. 1 is a schematic
structural diagram
of a vehicle 1 according to an embodiment of the present application. The
vehicle 1
may be a fuel-powered vehicle, a gas-powered vehicle or a new energy vehicle,
and the
new energy vehicle may be a battery electric vehicle, a hybrid vehicle, an
extended-
range vehicle, or the like. The vehicle 1 may be internally provided with a
motor 40, a
controller 30 and a battery 10, and the controller 30 is configured to control
the battery
to supply power to the motor 40. For example, the battery 10 may be disposed
at the
bottom, head or tail of the vehicle 1. The battery 10 may be used for power
supply to
the vehicle 1. For example, the battery 10 may serve as an operation power
source of
10 the vehicle 1 for a circuit system of the vehicle 1, for example, for a
working power
demand of the vehicle 1 during startup, navigation and running. In another
embodiment
of the present application, the battery 10 may serve not only as an operation
power
source of the vehicle 1, but also as a driving power source of the vehicle 1,
replacing or
partially replacing fuel or natural gas to provide a driving force for the
vehicle 1.
[0096] In order to meet different power demands, the battery may include a
plurality
of battery cells, where the plurality of battery cells may be in series
connection, parallel
connection or series-parallel connection. The series-parallel connection
refers to a
combination of series connection and parallel connection. The battery may also
be
referred to as a battery pack. Optionally, the plurality of battery cells may
be first
connected in series, in parallel or in series and parallel to constitute a
battery module,
and then a plurality of battery modules are connected in series, in parallel
or in series
and parallel to constitute the battery. That is, the plurality of battery
cells may directly
constitute the battery, or may first constitute a battery module, and then
battery modules
constitute the battery.
[0097] For example, as shown in FIG. 2, FIG. 2 is a schematic structural
diagram
of a battery 10 according to an embodiment of the present application. The
battery 10
may include a plurality of battery cells 20. The battery 10 may further
include a box
(which is also referred to as a covering), an inside of the box is a hollow
structure, and
the plurality of battery cells 20 are accommodated in the box. As shown in
FIG. 2, the
box may include two portions, which are referred to as a first portion 111 and
a second
17
CA 03166962 2022- 8-3
portion 112, respectively, and the first portion 111 and the second portion
112 are
fastened together. Shapes of the first portion 111 and the second portion 112
may be
determined according to a shape of a plurality of combined battery cells 20,
and the first
portion 111 and the second portion 112 may each have an opening. For example,
the
first portion 111 and the second portion 112 each may be a hollow cuboid and
each have
only one face as an opening face, and an opening of the first portion 111 is
arranged
opposite to an opening of the second portion 112. The first portion 111 and
the second
portion 112 are fastened to each other to form a box with a closed chamber.
The plurality
of battery cells 20 are combined in parallel connection or series connection
or series-
parallel connection and then placed in the box formed after the first portion
111 to the
second portion 112 are fastened.
[0098] Optionally, the battery 10 may further include other
structures, which will
not be repeated redundantly herein. For example, the battery 10 may further
include a
bus component. The bus component is configured to implement electrical
connection
between the plurality of battery cells 20, such as parallel connection, series
connection
or series-parallel connection. Specifically, the bus component may implement
the
electrical connection between the battery cells 20 by connecting electrode
terminals of
the battery cells 20. Further, the bus component may be fixed to the electrode
terminals
of the battery cells 20 by means of welding. Electric energy of the plurality
of battery
cells 20 may be further led out through an electrically conductive mechanism
to pass
through the box.
[0099] According to different power demands, the number of
battery cells 20 may
be set to any value. The plurality of battery cells 20 may be connected in
series, in
parallel or in series and parallel to implement larger capacity or power.
Since there may
be many battery cells 20 included in each battery 10, the battery cells 20 may
be
arranged in groups for convenience of installation, and each group of battery
cells 20
constitutes a battery module. The number of battery cells 20 included in the
battery
module is not limited and may be set according to demands. For example, FIG. 3
is an
example of the battery module. A battery may include a plurality of battery
modules,
and these battery modules may be connected in series, in parallel or in series
and parallel.
18
CA 03166962 2022- 8-3
[0100] As shown in FIG. 4, FIG. 4 is a schematic structural
diagram of a battery
cell 20 according to an embodiment of the present application. The battery
cell 20
includes one or more electrode assemblies 22, a housing 211 and a cover plate
212. The
housing 211 and the cover plate 212 form a shell 21. A wall of the housing 211
and the
cover plate 212 each are referred to as a wall of the battery cell 20. The
housing 211 is
shaped according to a shape of the one or more combined electrode assemblies
22. For
example, the housing 211 may be a hollow cuboid or cube or cylinder, and one
face of
the housing 211 has an opening, so that the one or more electrode assemblies
22 may
be placed in the housing 211. For example, when the housing 211 is a hollow
cuboid or
cube, one plane of the housing 211 is an opening face, that is, the plane does
not have
a wall, so that an inside and outside of the housing 211 are in communication
with each
other. When the housing 211 may be a hollow cylinder, an end face of the
housing 211
is an opening face, that is, the end face does not have a wall, so that an
inside and outside
of the housing 211 are in communication with each other. The cover plate 212
covers
the opening and is connected to the housing 211 to form a closed cavity in
which the
electrode assemblies 22 are placed. The housing 211 is filled with an
electrolyte, such
as an electrolytic solution.
[0101] The battery cell 20 may further include an electrode
terminal 214, and the
electrode terminal 214 may be disposed on the cover plate 212. One end of the
electrode
terminal 214 is connected to the electrode assemblies 22 inside the housing
211, and
the other end is connected to a power consumption device outside the housing
211, an
external power source or the like, for outputting electric energy of the
battery cell 20 or
charging the battery cell 20. The cover plate 212 is generally in a shape of a
flat plate,
and the electrode terminal 214 may include two electrode terminals 214. As
shown in
FIG. 4, the two electrode terminals 214 are fixed on a flat plate face of the
cover plate
212. The two electrode terminals 214 are a positive electrode terminal 214a
and a
negative electrode terminal 214b, respectively, or 214a and 214b may be
electrode
terminals with opposite polarities, which is not limited in the embodiments of
the
present application.
19
CA 03166962 2022- 8-3
[0102] In this battery cell 20, according to actual use
demands, the electrode
assembly 22 may be set to be single or multiple in number. As shown in FIG. 4,
four
independent electrode assemblies 22 are disposed in the battery cell 20.
[0103] As shown in FIG. 5, FIG. 5 is a schematic structural
diagram of a battery
cell 20 including a pressure relief mechanism 213 according to another
embodiment of
the present application.
[0104] A housing 211, a cover plate 212 and an electrode
assembly 22 in FIG. 5 are
consistent with the housing 211, the cover plate 212 and the electrode
assembly 22 in
FIG. 4, which will not be repeated redundantly herein for brevity.
[0105] The pressure relief mechanism 213 may further be disposed on one
wall of
the battery cell 20, such as a first wall 21a as shown in FIG. 5. In FIG. 5, a
bottom side
of the housing 211 has an opening, the first wall 21a covers the opening at
the bottom
side and is connected to the housing 211, and the connection manner may be
welding,
connecting with an adhesive, or the like. Alternatively, the first wall 21a
and the housing
211 may also be an integral structure. The pressure relief mechanism 213 is
configured
to be actuated when an internal pressure or temperature of the battery cell 20
reaches a
threshold, to relieve the internal pressure or temperature.
[0106] The pressure relief mechanism 213 may be a part of the
first wall 21a, or
may be a separate structure from the first wall 21a, and is fixed to the first
wall 21a by
means of welding, for example. When the pressure relief mechanism 213 is a
part of
the first wall 21a, for example, the pressure relief mechanism 213 may be
formed by
providing an indentation on the first wall 21a, and a thickness of the first
wall 21a
corresponding to the indentation is smaller than that of another region of the
pressure
relief mechanism 213 other than the indentation. The indentation is the
weakest position
of the pressure relief mechanism 213. When excessive gas generated by the
battery cell
20 causes an internal pressure of the housing 211 to rise and reach a
threshold, or heat
generated by an internal reaction of the battery cell 20 causes an internal
temperature
of the battery cell 20 to rise and reach a threshold, the pressure relief
mechanism 213
may be fractured at the indentation, resulting in the communication between
the inside
and outside of the housing 211. The gas pressure and temperature are released
outward
CA 03166962 2022- 8-3
through the cracking of the pressure relief mechanism 213, thereby avoiding
explosion
of the battery cell 20.
[0107] Optionally, in an embodiment of the present
application, as shown in FIG.
5, in a case where the pressure relief mechanism 213 is disposed on the first
wall 21a
of the battery cell 20, an electrode terminal 214 is disposed on another wall
of the
battery cell 20, and the wall provided with the electrode terminal 214 is
different from
the first wall 21a.
[0108] Optionally, the wall provided with the electrode
terminal 214 is arranged
opposite to the first wall 21a. For example, the first wall 21a may be a
bottom wall of
the battery cell 20, and the wall provided with the electrode terminal 214 may
be the
cover plate 212 of the battery cell 20.
[0109] Optionally, as shown in FIG. 5, the battery cell 20 may
further include a
backing plate 24. The backing plate 24 is located between the electrode
assembly 22
and a bottom wall of the housing 211, may play a role of supporting the
electrode
assembly 22, and may also effectively prevent the electrode assembly 22 from
interfering with rounded corners of a periphery of the bottom wall of the
housing 211.
In addition, one or more through holes may be disposed on the backing plate
24. For
example, a plurality of through holes evenly arranged may be disposed, or when
the
pressure relief mechanism 213 is disposed on the bottom wall of the housing
211, a
through hole is disposed at a position corresponding to the pressure relief
mechanism
213, so as to guide an electrolytic solution or gas. Specifically, this may
cause spaces
of an upper surface and a lower surface of the backing plate 24 to be in
communication,
and gas generated inside the battery cell 20 and the electrolytic solution can
freely pass
through the backing plate 24.
[0110] The pressure relief mechanism 213 and the electrode terminal 214 are
disposed on different walls of the battery cell 20, so that when the pressure
relief
mechanism 213 is actuated, emissions from the battery cell 20 may be farther
away
from the electrode terminal 214, thereby reducing the impact of the emissions
on the
electrode terminal 214 and the bus component, and therefore safety of the
battery could
be enhanced.
21
CA 03166962 2022- 8-3
[0111] The pressure relief mechanism 213 may be various
possible pressure relief
mechanisms, which is not limited in the embodiments of the present
application. For
example, the pressure relief mechanism 213 may be a temperature-sensitive
pressure
relief mechanism, the temperature-sensitive pressure relief mechanism is
configured to
be capable of being melted when the internal temperature of the battery cell
20 provided
with the pressure relief mechanism 213 reaches a threshold; and/or the
pressure relief
mechanism 213 may be a pressure-sensitive pressure relief mechanism, and the
pressure-sensitive pressure relief mechanism is configured to be capable of
being
fractured when an internal gas pressure of the battery cell 20 provided with
the pressure
relief mechanism 213 reaches a threshold.
[0112] In the foregoing embodiments, the pressure relief
mechanism 213 is located
on the first wall 21a of the housing 211 as an example. Optionally, the
pressure relief
mechanism 213 in the embodiments of the present application may be located on
the
cover plate 212, or the pressure relief mechanism 213 may be located on a side
wall of
the housing 211, or the pressure relief mechanism 213 may be disposed at a
corner part
of the housing 211, for example, located at a part where two intersecting
walls of the
housing 211 are connected to each other, such as a schematic diagram in which
a
pressure relief mechanism is located at a corner of a housing in an embodiment
of the
present application as shown in FIG. 6. Specifically, as shown in FIG. 6, a
pressure
relief mechanism 213 may be disposed at a junction of a first wall 21a and a
side wall
21b, and the position of the pressure relief mechanism 213 is not limited in
the present
application.
[0113] In the current solution of the pressure relief
mechanism 213, the internal
pressure or temperature can be released outward after the actuation of the
pressure relief
mechanism 213, to ensure the safety performance of the battery cell 20.
However, the
pressure relief mechanism 213 is affected by the internal temperature and
pressure of
the battery before the actuation to undergo creep deformation, and an
excessive amount
of deformation leads to creep failure of the pressure relief mechanism, which
reduces
the service life of the pressure relief mechanism 213.
22
CA 03166962 2022- 8-3
[0114] Moreover, in the battery 10, a gas production phenomenon
occurs due to gas
production of a chemical system as a chemical reaction goes on. After the
chemical
reaction occurs inside the battery 10 to produce gas, the gas inside the
battery 10
increases. Since the entire battery 10 is sealed, the chemical gas causes the
internal gas
pressure of the battery 10 to gradually increase from the perspective of the
entire service
cycle of the battery 10. However, the battery 10 experiences operating
conditions of
charging and discharging and an operating condition of storage during the use,
the
temperature of the battery 10 itself changes periodically in a manner of
increase-
decrease-increase under different use operating conductions, thereby resulting
in a
periodical change in air pressure inside the housing of the battery with
temperature, and
the pressure relief mechanism, as the weakest region of the entire housing
structure,
produces respiratory deformation with this change in air pressure. This
respiratory
deformation of the pressure relief mechanism 213 caused by the use operating
conditions of the battery cell 20 results in occurrence of a phenomenon of
respiratory
fatigue for the pressure relief mechanism 213 during the use. If the amount of
deformation is great, it results in a failure phenomenon for the pressure
relief
mechanism 213 due to the respiratory deformation. Moreover, when the pressure
relief
mechanism 213 is located on a wall of the housing 211 other than the cover
plate 212,
since the wall of the housing 211 is generally thinner than the cover plate
212, the wall
of the housing 211 on which the pressure relief mechanism 213 is located
greatly
deforms. Therefore, when the pressure relief mechanism 213 is located on a
wall of the
housing 211, the amount of deformation of the pressure relief mechanism 213 in
use is
greater than the amount of deformation of the pressure relief mechanism 213
located
on the cover plate 212.
[0115] With respect to the foregoing problem, in the present application, a
protective film is used to enclose at least one wall of the battery cell 20
that includes
the pressure relief mechanism 213, where the protective film may cover the
pressure
relief mechanism 213. On one hand, by covering a surface of the battery cell
20, the
protective film can insulate and protect the battery cell 20, thereby
improving insulation
and isolation performance of the battery cell 20. On the other hand, by
covering the
23
CA 03166962 2022- 8-3
pressure relief mechanism 213 of the battery cell 20, the protective film can
limit the
deformation of the pressure relief mechanism 213, thereby reducing the creep
deformation of the pressure relief mechanism 213, and increasing the service
life of the
pressure relief mechanism 213.
[0116] For ease of understanding, an example that a pressure relief
mechanism 213
in the embodiments of the present application is located on a first wall 21a
will be
described below, but the present application is not limited thereto.
[0117] The battery cell 20 in the embodiments of the present
application may
include: a pressure relief mechanism 213, the pressure relief mechanism 213
being
disposed on at least one wall of the battery cell 20, and the pressure relief
mechanism
213 being configured to be actuated when an internal pressure or temperature
of the
battery cell 20 reaches a threshold, to relieve the internal pressure; and a
protective film
50 enclosing an outer surface of the at least one wall, the protective film 50
being
configured to provide insulation protection for the at least one wall; where
the
protective film 50 includes a first portion 50, and the first portion 50 at
least covers the
pressure relief mechanism 213.
[0118] FIGS. 7a to 7d show schematic diagrams of a battery cell
covered with a
protective film according to an embodiment of the present application. FIG. 7a
is a
schematic diagram of a battery cell according to an embodiment of the present
application, FIG. 7b is a plan schematic diagram corresponding to the battery
cell in
FIG. 7a, and FIG. 7c is a partial detailed view corresponding to the
protective film.
[0119] It should be understood that, for convenience of visual
display of a first wall
21a, in the embodiment of the present application, the battery cell 20 in the
drawing is
placed upside down, that is, the first wall 21a faces upward and a cover plate
212 is
located at the bottom. However, the representation in the drawing of the
embodiment
of the present application is only for convenience of visual display, and does
not impose
other restrictions on the structure of the battery cell 20. For example, the
first wall 21a
in FIG. 7a faces upward, and the cover plate 212 faces downward, where an
electrode
terminal 214 and the like may be disposed on the cover plate 212.
24
CA 03166962 2022- 8-3
[0120] As shown in FIGS. 7a to 7c, the battery cell 20 includes
a pressure relief
mechanism 213, and a shape of the pressure relief mechanism 213 may be oblong,
circular, elliptical, polygonal, or the like. As shown in FIGS. 7a and 7b, the
pressure
relief mechanism 213 is oblong, and the longest distance between two points on
arcs at
both ends is a long diameter of the oblong. A direction of the long diameter
is parallel
to a direction of a line between two electrode terminals 214. Certainly, the
direction of
the long diameter of the pressure relief mechanism 213 can also be set to be
perpendicular to the direction of the line of the two electrode terminals. The
pressure
relief mechanism 213 may include a layer of pressure relief sheet, or may
include
multiple layers of pressure relief sheets stacked at intervals. The pressure
relief sheet
may be made of metal foil, such as aluminum foil or copper foil. The pressure
relief
sheet of the pressure relief mechanism 213 may be in a plane lamina shape,
which does
not occupy the extra volume of the battery cell, and improves the energy
density. The
pressure relief sheet of the pressure relief mechanism 213 may also be set in
an arc or
wave shape, and a certain amount of pre-deformation or pre-stress may be set
according
to the gas producing condition of the battery cell, to offset the deformation
effect caused
by some of gas production.
[0121] The pressure relief mechanism 213 is disposed on at
least one wall of the
battery cell 20, for example, on the first wall 21a, the side wall 21b of the
housing 211
or at the junction of the first wall 21a or the side wall 21b described above
here.
Certainly, the pressure relief mechanism 213 may also be located on the cover
plate 212
of the battery cell 20. The housing 211 of the battery cell 20 may be
integrally formed
to form an accommodating cavity for accommodating an electrode assembly, the
electrode assembly is placed into the accommodating cavity from an opening of
the
housing 211, the opening is covered with the cover plate 212, and the cover
plate 212
and the housing 211 are hermetically connected. The cover plate 212 may be
provided
with functional parts such as electrode terminals and an liquid injection hole
(not shown
in the drawing), and a thickness of the cover plate 212 may be set to be
greater than a
thickness of the housing 211 to maintain sufficient rigidity and intensity.
CA 03166962 2022- 8-3
[0122] The battery cell 20 further includes a protective film
50, and the protective
film 50 encloses an outer surface of the first wall 21a. Optionally, as shown
in FIG. 7a,
the protective film may enclose most of the area of the first wall 21a, or may
completely
enclose the first wall 21a. Certainly, the protective film may further enclose
side walls
of the housing 211, and the like (for example, dotted portions on the cover
plate 212
toward the bottom shown in FIG. 7a, which can represent that the protective
film 50
basically covers the entire surface of the housing 211 and edges of the
protective film
50 cover four sides of the cover plate 212 by a certain distance to maintain
that the
protective film 50 can completely cover all the outer surfaces of the housing
211 under
a predetermined tension). The protective film 50 may be made of polyester
resin or
polypropylene material, and may have a thickness of 0.03mm to 0.50mm,
optionally,
the protective film 50 may be 0.1mm to insulate and protect the metal cover
plate and
the housing of the battery cell 20.
[0123] The housing 211 and/or the cover plate 211 are enclosed
with the protective
film 50 after the steps such as a performance test are performed on the
battery cell 20
during the molding process of the battery cell 20, to keep the protective film
50
completely attached to the housing 211 and/or the cover plate 212 to avoid air
bubbles
between them, and then the final size detection or the like is performed to
complete the
molding of the battery cell 20. Since the protective film 50 needs to tightly
enclose the
housing 211 and/or the cover plate 212 of the battery cell 20 in a large area
to insulate
and protect the battery cell 20, the pressure relief mechanism disposed on the
housing
211 and/or the cover plate 212 may be optionally disposed on an inner side of
these
plates, or the point of the pressure relief mechanism at the outermost side
does not
protrude beyond the outer surface of these plates. When it is necessary to
process
corresponding fixing structures to install the pressure relief mechanism,
optionally, the
points of these fixing structures at the outermost side do not protrude beyond
the outer
surface of these plates. When a plurality of battery cells 20 are arranged in
parallel or
in series or in series and parallel to form a battery module or a battery
pack, it is
particularly important to keep a housing 211 and/or a cover plate 212 of each
battery
cell insulated from each other through the protective film 50.
26
CA 03166962 2022- 8-3
[0124] A first portion 510 of the protective film 50 at least
covers the pressure relief
mechanism 213. When the protective film 50 encloses the housing of the battery
cell
20 in a large area, the protective film 50 also covers the pressure relief
mechanism 213
from the outer side of the pressure relief mechanism 213. A portion of the
protective
film 50 that covers the pressure relief mechanism 213 is the first portion 510
of the
embodiment of the present application. As shown in FIGS. 7b and 7c, the first
portion
510 completely covers the pressure relief mechanism 213 from the outer side of
the
pressure relief mechanism 213 far away from the battery cell 20, thereby
limiting an
amount of deformation of the pressure relief mechanism 213 in a thickness
direction of
the housing 211, and avoiding creep failure and/or respiratory failure of the
pressure
relief mechanism 213 during the use.
[0125] By providing the protective film 50 at least covering a
surface of at least one
wall of the pressure relief mechanism 213 for the battery cell 20, on one
hand, a surface
of the battery cell can be insulated and protected, thereby improving
insulation and
isolation performance of the battery cell, and on the other hand, the
deformation of the
pressure relief mechanism 213 can be limited using the first portion 510 of
the
protective film 50 that covers the pressure relief mechanism 213, creep of the
pressure
relief mechanism 213 can be reduced, and the service life of the pressure
relief
mechanism 213 can be increased.
[0126] Meanwhile, compared with the solution in the prior art that an
additional
protective patch is disposed on an outer side of a pressure relief mechanism,
the solution
of the embodiment of the present application can directly apply the protective
film of
the battery cell to protect the pressure relief mechanism, which has an effect
of
protecting a patch and an effect of suppressing deformation. There is no need
to
additionally process fixing structures on the housing or the cover plate to
fix a protective
patch, and there is no need to additionally provide a protective patch, which
saves
production materials, reduces processing procedures, and reduces the
manufacturing
costs of the battery cell.
[0127] As an implementation manner, at least one wall of the
battery cell 20 in the
embodiment of the present application may include a housing 211, the housing
211
27
CA 03166962 2022- 8-3
forms an accommodating cavity with an opening for accommodating an electrode
assembly of the battery cell 20, and the protective film 50 encloses an outer
surface of
the housing 211.
[0128] Optionally, the housing 211 forms the accommodating
cavity, which can be
treat as the structural shape of the battery cell 20, for accommodating the
electrode
assembly. When the battery cell 20 is a square housing battery, the housing
211 includes
4 side walls and the first wall 21a except the cover plate 212, the protective
film 50
covers 5 walls except the cover plate 212; and when the battery cell 20 is a
cylindrical
battery, the housing 211 may include a cylindrical peripheral wall, or may
include a
cylindrical peripheral wall and a bottom wall. The pressure relief mechanism
213 is
disposed on the housing 211 enclosed by the protective film 50 described
above. The
enclosing may be to completely enclose the outer surface of the housing 211,
or may
be to enclose a portion of the outer surface of the housing 211.
[0129] As an implementation manner, since a thickness of the
housing 211 is less
than a thickness of the cover plate 212, the housing 211 deforms more easily
under the
impact of gas production inside the battery cell 20. When the pressure relief
mechanism
213 is disposed on the first wall 21a and/or a side wall of the housing 211,
the pressure
relief mechanism 213 also deforms more easily. The protective film 50 can
limit the
deformation of the pressure relief mechanism 213, thereby prolonging the
service life
of the pressure relief mechanism 213.
[0130] Alternatively, the pressure relief mechanism 213 in the
embodiment of the
present application may also be located on the cover plate 212. In this case,
the same
protective film 50 as the protective film 50 enclosing the housing 211 may
also be used
to cover all the outer surfaces of the cover plate 212 including the pressure
relief
mechanism 213, or cover at least a portion of the outer surface of the cover
plate 212
including the pressure relief mechanism 213.
[0131] As an implementation manner, an area of the first
portion 510 of the
protective film 50 in the embodiment of the present application is larger than
an area of
a region where the pressure relief mechanism 213 is located, and a region of
the first
28
CA 03166962 2022- 8-3
portion 510 that exceeds the pressure relief mechanism 213 is adhered to the
outer
surface of the at least one wall.
[0132] As shown in FIG. 7b, a dashed portion in the middle of
the oblong region in
FIG. 7b is an edge of the pressure relief mechanism 213 covered by the
protective film
50, and a portion with a solid line at an outer side the pressure relief
mechanism 213 is
an edge of the first portion 510 of the protective film 50. The edge of the
first portion
510 exceeds the edge of the pressure relief mechanism 213, that is, the area
of the first
portion 510 is larger than the area of the region where the pressure relief
mechanism
213 is located. A portion of the first portion 510 that exceeds the pressure
relief
mechanism 213 may be fixedly connected to the at least one wall of the battery
cell 20,
and the portion of the first portion 510 that is fixedly connected to the at
least one wall
maintains tension of the protective film 50, so that the protective film 50
has a certain
rigidity. When the pressure relief mechanism 213 undergoes creep deformation
or
respiratory deformation, the first portion 510 can suppress the deformation of
the
pressure relief mechanism 213 using the rigidity, and an amount of creep
deformation
of the pressure relief mechanism 213 can reduced, thereby increasing the
service life of
the pressure relief mechanism 213.
[0133] It should be understood that the first portion 510 of
the protective film 50 in
the embodiment of the present application can limit the deformation of the
pressure
relief mechanism 213 to some extent. When the internal pressure of the battery
cell 20
reaches or exceeds an actuation threshold of the pressure relief mechanism
213, the
pressure relief mechanism 213 is activated, and the first portion 510 is also
damaged,
thereby ensuring the normal operation of the pressure relief mechanism 213 and
ensuring the safety performance of the battery.
[0134] Specifically, for example, when the battery cell 20 is in normal
use, the
internal air pressure of the battery cell 20 generally does not exceed 0.5MPa.
During
the normal use, the first portion 510 can suppress the deformation of the
pressure relief
mechanism 213. However, when the internal air pressure exceeds 0.5MPa, the
amount
of deformation of the pressure relief mechanism 213 is too great, and the
first portion
29
CA 03166962 2022- 8-3
510 can be broken through from the surface of the at least one wall, so that
the pressure
relief mechanism 213 can be actuated normally to release the internal
pressure.
[0135] As an implementation manner, a shape of the first
portion 510 of the
protective film 50 in the embodiment of the present application is the same as
or similar
to that of the pressure relief mechanism 213.
[0136] As shown in FIG. 7b, the shape of the first portion 510
is the same as that
of the pressure relief mechanism 213. The shapes of the two are set to be the
same so
that tension generated by the deformation of the pressure relief mechanism 213
that the
first portion 510 is subjected to is uniform, which is more beneficial to
suppression of
the deformation of the pressure relief mechanism 213 by the first portion 510,
or the
two may be in similar shapes or different shapes, such as rectangles, which is
not limited
in the embodiments of the present application.
[0137] As an implementation manner, a distance T by which an
edge of the first
portion 510 in the embodiment of the present application exceeds an edge of
the
pressure relief mechanism 213 is 6mm-10mm in a direction far away from a
center of
the pressure relief mechanism 213.
[0138] As shown in FIG. 7b, a distance between the edge of the
first portion 510,
that is, the solid line portion in the middle, and the edge of the pressure
relief mechanism
213, that is, the dotted portion in the middle, may be set to be 6mm to lOmm.
Since a
portion of the first portion 510 that exceeds the edge of the pressure relief
mechanism
213 is adhered to the at least one wall of the battery cell 20, there is a
certain restraint
between the two. By adjusting the distance by which the edge of the first
portion 510
exceeds the edge of the pressure relief mechanism 213, the magnitude of a
restraining
force between the first portion 510 and the at least one wall of the battery
cell 20 can
be adjusted, and it can be ensured that the first portion 510 can have a
suppression effect
on the deformation of the pressure relief mechanism 213 during the normal use
of the
battery cell 20. Optionally, when the area of the pressure relief mechanism
213 is large
and a great amount of creep deformation occurs, a greater distance T needs to
be set to
produce a restraining force on the great amount of deformation, and when the
area of
the pressure relief mechanism 213 is small, a less distance T can be set. When
the
CA 03166962 2022- 8-3
internal pressure and temperature of the battery cell 20 reach a certain
threshold and the
internal pressure needs to be released, the setting of the distance T can
enable the first
portion 510 to be broken through by the pressure relief mechanism 213 and fall
off from
the at least one wall of the battery cell 20, which does not affect the normal
use of the
pressure relief mechanism 213, and further ensures the safety of the battery.
[0139] For example, the edge of the first portion 510 can be
set to exceed the edge
of the pressure relief mechanism 213 by 6mm. When the battery cell 20 is in
normal
use, its internal pressure is generally not greater than 0.5MPa. In this case,
the
restraining force between the first portion 510 and the at least one wall is
great enough
to ensure that the first portion 510 is not broken through by the pressure
relief
mechanism 213 to fall off When the internal pressure of the battery cell 20 is
greater
than 0.5MPa, the deformation of the pressure relief mechanism 213 can cause
the first
portion 510 to fall off from the at least one wall.
[0140] It should be understood that the relationship between
the falling off of the
first portion 510 and the internal pressure of the battery cell 20 is merely
exemplarily
described above, and the magnitude of the pressure and the set size therein
may also be
set to be other values, which is not limited in the embodiments of the present
application.
[0141] As an implementation manner, the protective film 50 in
the embodiment of
the present application may be made of polyester resin (Polyethylene
terephthalate,
PET) or polypropylene PP material. The protective film 50 may also be a blue
film
commonly used in the field of batteries, or optionally, the protective film 50
in the
embodiment of the present application may also be made of other materials,
which is
not limited in the embodiments of the present application.
[0142] As an implementation manner, the protective film in the
embodiment of the
present application may further include an isolation region 530 and a second
portion
520, the firs portion 510 is separated from the second portion 520 by the
isolation region
530, and the second portion 520 covers an outer surface of the at least one
wall other
than a region covered by the first portion 510.
[0143] As shown in FIGS. 7a to 7c, the protective film 50 may
include the first
portion 510 and the second portion 520, where the first portion 510 and the
second
31
CA 03166962 2022- 8-3
portion 520 are separated by the isolation region 530, the first portion 510
at least covers
the outer surface of the pressure relief mechanism 213 disposed on the at
least one wall,
and the second portion 520 covers an outer surface of the at least one wall
other than
the outer surface covered by the first portion 510. Optionally, the second
portion 520
may cover regions of all the walls of the battery cell 20 other than the
region covered
by the first portion 510, that is, the second portion 520 may cover all the
outer surfaces
of peripheral walls and a top cover other than the outer surface covered by
the first
portion 510, or the second portion 520 may also cover only a portion of them,
for
example, only an outer surface of a wall containing the pressure relief
mechanism 213
other than the outer surface covered by the first portion 510, such as the
first wall 21a
in FIGS. 7a to 7c.
[0144] Optionally, the isolation region 530 in the embodiment
of the present
application may be a linear region, the region includes a missing portion of
the
protective film 50. As shown in FIG. 7c, the isolation region 530 includes a
portion
between the first portion 510 and the second portion 520 of the protective
film 50 that
lacks a part of the material of the protective film 50, that is, the two
portions are
separated in material. The linear isolation region 530 as shown in FIGS. 7a to
7c may
also be an isolation band with a relatively wide width, which is not limited
in the present
application.
[0145] As an implementation manner, the isolation region 530 in the
embodiment
of the present application may be disposed around an outer edge of the
pressure relief
mechanism 213.
[0146] As shown in FIG. 7b, the isolation region 530 is
disposed around the edge
of the pressure relief mechanism 213 to form the first portion 510 at least
covering the
pressure relief mechanism 213 and the second portion 520 covering the outer
surface
other than the region covered by the first portion 510.
[0147] As an implementation manner, the isolation region 530
in the embodiment
of the present application may be coherent, and the first portion 510 and the
second
portion 520 are not connected.
32
CA 03166962 2022- 8-3
[0148] Specifically, as shown in FIG. 7b, the isolation region
530 is in a coherently
annular shape, and the first portion 510 and the second portion 520 can be
completely
separated by the isolation region 530, that is, there is no connecting point
between the
first portion 510 and the second portion 520. In this case, since there are
partially
adhered regions between the first portion 510 and the surface of the at least
one wall, a
restraining force exists between the partially adhered regions can ensure that
the first
portion 510 has a suppression effect on the deformation of the pressure relief
mechanism 213, thereby suppressing creep of the pressure relief mechanism 213,
and
increasing the service life of the pressure relief mechanism 213. Meanwhile,
when the
internal pressure and temperature of the pressure relief mechanism 213 reach a
certain
threshold, the first portion 510 may be broken through to allow the first
portion 510 to
fall off from the surface of the at least one wall, so that the pressure
relief mechanism
213 is normally actuated to discharge the internal emissions, and ensure the
safe use of
the battery.
[0149] It should be understood that when the isolation region 530 in the
embodiment of the present application is coherent without a connecting point,
the area
of the first portion 510 of the protective film 50 in the embodiment of the
present
application may be larger than the area of the region where the pressure
relief
mechanism 213 is located, so as to ensure that a partial region of the first
portion 510
can be adhered to the surface of the at least one wall, thereby producing a
restraining
force that can suppress the deformation of the pressure relief mechanism 213.
[0150] As another implementation manner, the isolation region
530 in the
embodiment of the present application may be incoherent, a connecting point
540 is
disposed between the first portion 510 and the second portion 520, and the
first portion
510 and the second portion 520 are connected through the connecting point 540.
[0151] Specifically, FIG. 8 shows a plan schematic diagram of
an incoherent
isolation region in an embodiment of the present application. As shown in FIG.
8, the
isolation region 530 is further provided with connecting point 540, that is,
the first
portion 510 and the second portion 520 can be connected through the connecting
point
540, and the first portion 510 and the second portion 520 are not completely
separated.
33
CA 03166962 2022- 8-3
The second portion 520 may have effects of restraining on and transmitting
force to the
first portion 510 through the connecting point 540. In this case, the edge
region of the
first portion 510 may be set to be relatively small accordingly.
[0152] As an implementation manner, a number of connecting
points 540 in the
embodiment of the present application may be positively correlated with a size
of an
edge of the first portion 510 that exceeds an edge of the pressure relief
mechanism 213
in a direction far away from a center of the pressure relief mechanism 213.
[0153] It can be seen from the above that the adhered portion
between the first
portion 510 of the protective film 50 and the at least one wall of the battery
cell 20 may
produce a restraining force to suppress the deformation of the pressure relief
mechanism
213. Within a certain range, the distance by which the edge of the first
portion 510
exceeds the edge of the pressure relief mechanism 213 in the direction far
away from
the center of the pressure relief mechanism 213 is greater, and an adhesive
force
produced between the two is greater. When the connecting point 540 is disposed
on the
isolation region 530, since the connecting point 540 connect the first portion
510 and
the second portion 520, the second portion 520 may have a restraining force
for the first
portion 510, and the second portion 520 encloses other areas of at least one
housing, is
tightly adhered to the housing, and has a strong restraining force. Therefore,
by
providing the connecting point 540, the restraining force for the first
portion 510 can
be enhanced with the help of a fixing force such as the adhesion between the
second
portion 520 and the at least one wall, thereby reducing the area of the first
portion 510.
Within a certain range, the number of connecting points 540 is greater, the
restraining
force produced by the existence of the connecting points 540 is greater.
Therefore,
further, the number of connecting points 540 may be set to be correlated with
the area
of the foregoing adhered portion, that is, the size of the edge of the first
portion 510 that
exceeds the edge of the pressure relief mechanism 213 in the direction far
away from
the center of the pressure relief mechanism 213 is greater, and the number of
provided
connecting points 540 is less. On the contrary, the foregoing size is less,
and the number
of provided connecting points 540 is more. In this way, the restraining force
produced
by the portion where the first portion 510 is adhered to the surface of the at
least one
34
CA 03166962 2022- 8-3
wall and the restraining force produced by the existence of the connecting
points 540
can suppress the deformation of the pressure relief mechanism 213 together,
and could
ensure that the first portion 510 can be broken through to fall off when the
internal
pressure and temperature of the press relief mechanism 213 reach a certain
threshold,
thereby ensuring the normal actuation of the pressure relief mechanism 213.
[0154] As an implementation manner, the battery cell 20 in the
embodiment of the
present application includes two electrode terminals 214 with opposite
polarities, and
at least two connecting points 540 are disposed along a direction of a line
between the
two electrode terminals 214.
[0155] As shown in FIG. 8, the battery cell 20 includes two electrode
terminals 214,
which may include a positive electrode terminal and a negative electrode
terminal.
When the pressure relief mechanism 213 is arranged in the manner shown in FIG.
8,
that is, corresponding to a case where the pressure relief mechanism 213 is
located on
the first wall 21a or the cover plate 212, a direction of a long diameter of
the oblong
pressure relief mechanism 213 is parallel to a direction of a line between the
two
electrode terminals 214. When the pressure relief mechanism 213 deforms, the
position
of the maximum amount of deformation is at the direction of the line of the
two
electrode terminals 214. Corresponding to the first portion 510, in order to
suppress the
deformation of the pressure relief mechanism 213 better, according to the
deformation
characteristics of the pressure relief mechanism 213, the connecting points
540 may be
disposed in a straight line portion located in the isolation region 530 that
is parallel to
the line of the two electrode terminals, as shown in FIG. 8.
[0156] Optionally, the pressure relief mechanism 213 in the
embodiment of the
present application may not be arranged in the manner shown in FIG. 8. In an
example
that the pressure relief mechanism 213 is oblong, the pressure relief
mechanism 213
may be arranged in a manner such that the direction of the long diameter of
the pressure
relief mechanism 213 is perpendicular to the direction of the line of the two
electrode
terminals 214. In this case, the arrangement of the positions of the
connecting points
540 may also be set according to the foregoing principle, that is, the
connecting points
540 are disposed in a region of the isolation region 530 that is parallel to
the direction
CA 03166962 2022- 8-3
of the line of the two electrode terminals 214. In other words, the
arrangement of the
positions of the connecting points 540 in the embodiment of the present
application has
a direct relationship with the direction of the line of the electrode
terminals, but has no
direct relationship with the shape and arrangement of the pressure relief
mechanism
213.
[0157] As an implementation manner, the connecting point 540
may also be
disposed at other positions of the isolation region 530 in the embodiment of
the present
application.
[0158] FIG. 9 shows a schematic diagram of another incoherent
isolation region
according to an embodiment of the present application. As shown in FIG. 9, the
connecting points 540 may also be disposed in curved portions of the isolation
region
530 to enhance the suppression effect of the first portion 510 on the
deformation of the
pressure relief mechanism 213. The isolation region 530 in the embodiment of
the
present application may include a plurality of connecting points 540, and the
plurality
of connecting points 540 may be distributed at equal intervals, for example,
arranged at
equal angles or arc lengths, or may be distributed at unequal intervals. The
number and
the arrangement of positions of connecting points 540 are not limited in the
embodiments of the present application.
[0159] In the foregoing description, the area of the first
portion 510 is larger than
the region where the pressure relief mechanism 213 is located. Optionally,
when the
connecting points 540 are disposed on the isolation region 530, the edge of
the first
portion 510 may overlap with the edge of the pressure relief mechanism 213.
[0160] Specifically, FIG. 10 shows a schematic diagram of
another incoherent
isolation region in an embodiment of the present application. As shown in FIG.
10,
since the edge of the first portion 510 overlaps with the edge of the pressure
relief
mechanism 213, only the edge of the first portion 510 is marked in FIG. 10.
Moreover,
FIG. 10 shows another embodiment of a structure of distribution of connecting
points
540, that is, a line between a connecting point 540 and a center of a circle
of the oblong
may also be set as a region where the line and a line between two electrode
terminals
form a predetermined included angle. The predetermined included angle may be,
for
36
CA 03166962 2022- 8-3
example, within a range of 0 degree to 90 degrees, so as to adjust the number
of
connecting points 540 to adapt to a change in area of the first portion 510.
It should be
understood that the arrangement schemes of the connecting points 540 shown in
FIGS.
8 to 12 of the present application do not strictly correspond to the structure
of the first
portion 510 in the corresponding drawings, and FIGS. 8 to 12 only exemplarily
show
the possible arrangement of the connecting points 540, which is not limited
thereto.
[0161] It should be understood that the pressure relief
mechanism 213 of the
embodiment of the present application may be disposed on one of walls of the
housing
211, such as the first wall 21a described above, for example, as shown in
FIGS. 8 to 10,
or the pressure relief mechanism in the embodiment of the present application
may be
disposed on a side wall of the housing 211, but the present application is not
limited
thereto.
[0162] Specifically, FIG. 11 shows a plan schematic diagram of
a protective film
according to an embodiment of the present application. The protective film 50
may be
applicable to a case where the pressure relief mechanism 213 is disposed on
any one of
the walls of the housing 211, such as a side wall or a bottom wall. In this
case, the
protective film 50 may not be provided with an opening corresponding to an
electrode
terminal 214. The rest of the content is the same as the foregoing case when
the pressure
relief mechanism 213 is located on the first wall 21a, which will not be
repeated
redundantly herein.
[0163] Optionally, since the cover plate 212 and the housing
211 of the battery cell
20 are usually two separate parts, in a case where the pressure relief
mechanism 213 is
disposed on the cover plate 212, the second portion 520 of the protective film
50 may
further include a region for accommodating an electrode terminal 214.
Specifically, FIG.
12 shows a plan schematic diagram of a protective film 50 according to an
embodiment
of the present application. As shown in FIG. 12, the protective film 50 may
further
include openings 550 for accommodating electrode terminals 214.
[0164] As an implementation manner, the protective film 50 in
the embodiment of
the present application may be a patch, and the protective film 50 is adhered
to the outer
surface of the at least one wall by an adhesive.
37
CA 03166962 2022- 8-3
[0165] For example, the protective film 50 may be a plastic
patch, or may be
referred to as a blue film, such as a plastic patch made of polyester resin or
polypropylene material. The patch may be adhered to an outer surface of at
least one
wall including a pressure relief mechanism by an adhesive.
[0166] Optionally, the protective film 50 in the embodiment of the present
application may be adhered to an outer surface of at least one wall by an
adhesive, or
fixed to the outer surface of the at least one wall by other means, which is
not limited
in the present application.
[0167] When the protective film 50 in the embodiment of the
present application is
a plastic patch, since the plastic patch is pasted on an outer surface of at
least one wall
of the battery cell 20, there may a certain gap between the protective film 50
and the
pressure relief mechanism 213, that is, the first portion 510 is spaced apart
from the
pressure relief mechanism 213. When there is a gap between the two, the
pressure relief
mechanism 213 may deform to some extent in a space allowed by the gap. The
first
portion 510 suppresses the deformation of the pressure relief mechanism 213
once an
amount of deformation of the pressure relief mechanism 213 exceeds the
distance of
the gap in the thickness direction of the housing 211, the deformation of the
pressure
relief mechanism caused by respiratory deformation of the housing is reduced,
and
creep deformation is suppressed, thereby avoiding the failure of the pressure
relief
mechanism 213 caused by these two kinds of deformation.
[0168] Specifically, the first portion 510 of the protective
film 50 may suppress a
certain degree of deformation of the pressure relief mechanism 213 using the
adhesion
with the at least one wall and/or the restraining force produced between the
first portion
510 and the connecting point 540, and the creep of the pressure relief
mechanism 213
can be reduced, thereby increasing the service life of the pressure relief
mechanism 213.
[0169] Optionally, when the protective film 50 in the
embodiment of the present
application adopts the manner of the foregoing patch, an isolation region 530
may be
formed by laser ablation of the protective film 50.
[0170] Specifically, at least one wall of the battery cell 20
may be first covered with
the foregoing patch. In this case, the patch is a complete whole, and then an
isolation
38
CA 03166962 2022- 8-3
region 530 is formed on the patch through a laser cutting process, thereby
dividing the
protective film 50 into a first portion 510 and a second portion 520.
[0171] The first portion 510 for suppressing the deformation
of the pressure relief
mechanism 213 may be formed on the basis of the protective film 50 through the
isolation region 530 in the embodiment of the present application obtained by
the laser
ablation process. On one hand, using the existing process flows, timely
adjustment of
the shape and size of the protective film 50 may be implemented by controlling
a motion
track and ablation power of a laser head, and there is no need to repeat open
molding,
thereby reducing the processing costs. On the other hand, the processed
protective film
50 may insulate and protect the battery cell 20. For example, in a liquid
injection
process during the production of the battery cell 20, the processed protective
film 50
can effectively prevent an electrolytic solution from being in contact with
the pressure
relief mechanism 213, thereby protecting the pressure relief mechanism 213,
and the
suppression of a certain degree of deformation of the pressure relief
mechanism 213
can be implemented, thereby increasing the service life of the pressure relief
mechanism
213.
[0172] As another implementation manner, the protective film
50 in the
embodiment of the present application may also be a coating, and outer
surfaces of the
at least one wall and the pressure relief mechanism 213 are coated with the
protective
film 50 by means of spraying.
[0173] When the protective film 50 adopts a coating, an
isolation region 530 may
be formed by skipping coating some reserved region when surfaces of the at
least one
wall and the pressure relief mechanism 213 are coated with the protective film
50. For
example, a template may be placed in advance at the position of the isolation
region
530 to prevent the coating from being sprayed on the position of the isolation
region
530.
[0174] Optionally, when the protective film 50 adopts a
coating, the coating may
directly cover the surface of the pressure relief mechanism 213. Since a
coating with a
great thickness may have a greater restraint effect on the deformation of the
pressure
relief mechanism 213, in this case, the coating thickness of the first portion
510 can be
39
CA 03166962 2022- 8-3
set to be greater than the coating thickness of the second portion 520, so as
to achieve
a better effect of suppressing the deformation of the pressure relief
mechanism 213.
[0175] Optionally, when the protective film 50 in the
embodiment of the present
application adopts a coating, since the first portion 510 and the pressure
relief
mechanism 213 are adhered to each other, there is a certain restraint between
the two,
and the edge of the first portion 510 can overlap with the edge of the
pressure relief
mechanism 213, or the edge of the first portion 510 can be set to exceed the
edge of the
pressure relief mechanism 213 according to the foregoing embodiment. Further,
a
connecting point 540 may be disposed on the isolation region 530, and the
specific
implementation manner is not limited in the embodiments of the present
application.
[0176] As an implementation manner, the battery 10 in the
embodiments of the
present application may include a plurality of battery cells, and the
plurality of battery
cells include at least one battery cell 20 in each of the foregoing
embodiments, where
the plurality of battery cells 20 are insulated from each other through the
protective film
50.
[0177] An embodiment of the present application further
provides a power
consumption apparatus, and the power consumption apparatus may include the
battery
10 in each of the foregoing embodiments. Optionally, the power consumption
apparatus
may be a vehicle 1, a ship or a spacecraft.
[0178] The battery cell, the battery and the power consumption apparatus
according
to the embodiments of the present application are described above. A method
and an
apparatus for producing a battery according to the embodiments of the present
application will be described below, and for the parts that are not described
in detail,
reference is made to each of the foregoing embodiments.
[0179] FIG. 13 shows a schematic flowchart of a method 300 for producing a
battery cell according to an embodiment of the present application. As shown
in FIG.
13, the method 300 may include:
[0180] S310, disposing a pressure relief mechanism 213 on at
least one wall of the
battery cell 20.
CA 03166962 2022- 8-3
[0181] As an implementation manner, the pressure relief
mechanism 213 is
configured to be actuated when an internal pressure or temperature of the
battery cell
20 reaches a threshold, to relieve the internal pressure.
[0182] S320, an outer surface of the at least one wall is
enclosed with a protective
film 50, the protective film 50 being configured to provide insulation
protection for the
at least one wall.
[0183] As an implementation manner, the protective film 50
includes a first portion,
and the first portion at least covers the pressure relief mechanism 213.
[0184] FIG. 14 shows a schematic block diagram of an apparatus
400 for producing
a battery cell according to an embodiment of the present application. As shown
in FIG.
14, the apparatus 400 for producing a battery may include: a setting module
410.
[0185] The setting module 410 is configured to: dispose a
pressure relief
mechanism 213 on at least one wall of the battery cell 20, the pressure relief
mechanism
213 being configured to be actuated when an internal pressure or temperature
of the
battery cell 20 reaches a threshold, to relieve the internal pressure; and
cover an outer
surface of the at least one wall with a protective film 50, the protective
film 50 being
configured to provide insulation protection for the at least one wall; where
the
protective film 50 includes a first portion 510, and the first portion at
least covers the
pressure relief mechanism 213.
[0186] Although the present application is already described with reference
to the
preferred embodiments, various improvements may be made to the present
application
and the components therein may be replaced with equivalents without departing
from
the scope of the present application. In particular, as long as there is no
structural
conflict, various technical features mentioned in the various embodiments may
be
combined in any manner. The present application is not limited to the specific
embodiments disclosed herein, and includes all technical solutions falling
within the
scope of the claims.
41
CA 03166962 2022- 8-3
